Ultrasonic nondestructive material evaluation method and study on texture and cross slip effects under simple and pure shear states

Kobayashi, Michiaki; Tang, Sai; Miura, Setsuo; Iwabuchi, Kazuya; Oomori, Seiichi; Fujiki, Hiroyuki

doi:10.1016/s0749-6419(02)00006-2

Cited by 51 publications

(14 citation statements)

References 32 publications

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“…Another important aspect of these techniques is that sound can propagate through various types of samples, such as concentrated, opaque liquid systems, and porous bodies [23,24], offering exceptional insight. Particularly, ultrasound measurements could be used to characterize also concentrated dispersions and emulsions as they are, excluding the need for dilution, which is a requirement in other traditional characterization techniques [23,24,25,26]. In this context, considerable attention has been directed towards the use of ultrasonic methods in material characterization.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Antibacterial Activity of Zinc-Doped Hydroxyapatite Colloids and Dispersion Stability Using Ultrasounds

et al. 2019

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This study proves that the new developed zinc-doped hydroxyapatite (ZnHAp) colloids by an adapted sol-gel method can be widely used in the pharmaceutical, medical, and environmental industries. ZnHAp nanoparticles were stabilized in an aqueous solution, and their colloidal dispersions have been characterized by different techniques. Scanning Electron Microscopy (SEM) was used to get information on the morphology and composition of the investigated samples. Energy-dispersive X-ray spectroscopy (EDX) analysis confirmed the elemental compositions of ZnHAp colloidal dispersions. The homogeneous and uniform distribution of constituent elements (zinc, calcium, phosphorus, oxygen) was highlighted by the obtained elemental mapping results. The X-ray diffraction (XRD) results of the obtained samples showed a single phase corresponding to the hexagonal hydroxyapatite. The characteristic bands of the hydroxyapatite structure were also evidenced by Fourier-transform infrared spectroscopy (FTIR) analysis. For a stability assessment of the colloidal system, ζ-potential for the ZnHAp dispersions was estimated. Dynamic light scattering (DLS) was used to determine particles dispersion and hydrodynamic diameter (DHYD). The goal of this study was to provide for the first time information on the stability of ZnHAp particles in solutions evaluated by non–destructive ultrasound-based technique. In this work, the influence of the ZnHAp colloidal solutions stability on the development of bacteria, such as Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), was also established for the first time. The antimicrobial activity of ZnHAp solutions was strongly influenced by both the stability of the solutions and the amount of Zn.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Antibacterial Activity of Zinc-Doped Hydroxyapatite Colloids and Dispersion Stability Using Ultrasounds

et al. 2019

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“…Schematic geometry of intersected crossing between two stationary discontinuity bands and micro-crack orientation (11) , (12) したアルミ合金(A6061)の値を用いている．…”

Section: 述する．関数の跳び [ ] は不連続帯の前と後のmentioning

confidence: 99%

Study on Dependence of Ductile Fracture Progress on Grain-Boundary Due to FCC Tri-Crystal Model

Kobayashi

Gotoh²,

Okuda³

et al. 2013

Trans.JSME, Ser.A

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Based on shock wave theory one of the authors derived the criterion of the micro-crack nucleation, namely the micro-crack nucleation is caused by the jump of the velocity along the intersected crossing line between two different stationary discontinuity bands characterized by vanishing velocity of an acceleration wave. In the previous paper, to consider dependence of the progress of ductile fracture of crystal solids on crystal orientations, the algorithm of acoustic tensors derived from the proposed model was built into finite element crystal plasticity model (FEPM) and the progresses of the ductile fracture in FCC bi-crystal and tri-crystal were analyzed. Then, the role of the crystal orientation and the grain boundary in the trigger of the transcrystalline fracture or intercrystalline fracture in the bi-crystal and also the role of the grain-boundary triple junction in the trigger of the ductile fracture in the tri-crystal were studied. In the present paper, the dependence of the ductile fracture progress on the grain-boundary is examined due to the FCC tri-crystal model consisted with 3 grains which are chacterized by single slip system, in-plane 4 slip systems and out-of-plane 4 slip systems.

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“…Case3 で構成したものを Type3 とした．これらの 6 モデルを用いて，局所変形および延性破壊の結晶方位依存性を検討した．なお，損傷評価に際して Christoffel テンソルの計算に用いた物性値は，複合負荷状態における超音波縦波および横波の伝搬速度変化と，後続降伏曲面の形状変化に関して行った数値シミュレーション結果の妥当性を実験的に検証 (9), (10 …”

Section: 緒言unclassified

Crystal Orientation Dependence of Deformation Localization and Ductile Fracture in FCC Bi-Crystal Materials

Tsuchiya¹,

Miura²,

Shibano³

et al. 2011

Trans.JSME, Ser.A

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In the authors" previous studies, the theoretical model of ultrasonic wave velocity propagating in plastically deformed solids has been proposed by one of the authors and successively verified experimentally. Then, deformation localization was analyzed by adopting the proposed theoretical model. The onset of localization of plastic deformation has been defined as the occurrence of ""stationary discontinuity" characterized by a vanishing velocity of an acceleration wave based on acceleration wave theory. Moreover, based on shock wave theory one of the authors derived that the micro-crack nucleation is caused by the jump of the velocity along the intersected crossing line between two different stationary discontinuity bands characterized by vanishing velocity of an acceleration wave. In the previous paper, to consider dependence of the progress of ductile fracture of crystal solids on crystal orientations the algorithm of acoustic tensors derived from the proposed model was built into finite element crystal plasticity model (FEPM) and the progress of ductile fracture in FCC single crystals was analyzed. In this paper, dependence of the ductile fracture progress in FCC bi-crystal models on combinations of crystal orientations is examined.

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Ultrasonic nondestructive material evaluation method and study on texture and cross slip effects under simple and pure shear states

Cited by 51 publications

References 32 publications

Evaluation of Antibacterial Activity of Zinc-Doped Hydroxyapatite Colloids and Dispersion Stability Using Ultrasounds

Evaluation of Antibacterial Activity of Zinc-Doped Hydroxyapatite Colloids and Dispersion Stability Using Ultrasounds

Study on Dependence of Ductile Fracture Progress on Grain-Boundary Due to FCC Tri-Crystal Model

Crystal Orientation Dependence of Deformation Localization and Ductile Fracture in FCC Bi-Crystal Materials

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